Combine your view, presenter and interactor interfaces into a single interface.

[crazyhitty]

For example, currently you are creating 3 files like this:

View.java

public interface View{
    // Some methods here.
}

Presenter.java

public interface Presenter{
    // Some methods here.
}

Interactor.java

public interface Interactor{
    // Some methods here.
}

Instead, you can create a single file which will host all 3 of them together.

Contract.java

public interface Contract{
    interface View{
        // Some methods here.
    }

    interface Presenter{
        // Some methods here.
    }

    interface Interactor{
        // Some methods here.
    }
}

Thus, this will reduce the amount of files you have in your project.